Coffee Slumps to Four-Year Low

Futures Lose 3.6% Amid Supply Surplus

Alexandra Wexler

Updated Sept. 17, 2013 4:08 p.m. ET

NEW YORK—Arabica-coffee futures tumbled to their lowest price in more than four years as investors focused on massive global supplies.

Earlier this week, the Green Coffee Association, an industry group, said U.S. stocks of unroasted coffee in August rose 2.4% from the previous month to 5.56 million 60-kilogram (132-pound) bags. That is the most coffee in domestic warehouses since July 2009, the last time prices traded at current...